Type B-3A (24 volts D.C.), serial no. 15324 and 14905, MFRs assembly part no. B-134465, specification no. 93-24717-A, order no. (33-038), 45-5452-P, pat nos. 2,080,273 - 2,347,481, MFR P.R. Mallory & Co., Inc, Indianapolis, IN, mounting brackets attached, 9.5" x 3.5", serial no. 14905 (with instructions on front), serial no. 15324 (without instructions).
